Yes, that is one of the major risks of breaking these laws: Girls at that age, or even in their later adolescent years to very early 20s, are going to change. How they felt about the relationship at the time is what should be important. However, between then and later, a girl can run into many different influences. Among them could be a crowd of judgmental friends who harangue her for not finding anything "bad" about a mutually consensual experience with an adult man at 12. This can fill her with shame, causing a girl without the highest level of self-esteem and inner strength to change her opinion under duress, so that she no longer feels ostracized by the "crowd." This can result in a girl later reporting such experiences as a crime to assuage these new feelings of guilt.

Another possible influence is the one that quite likely happened to the girl in the news story you quoted: She married a police officer. This man would very likely--and very obviously--hold a huge bias against adult attraction to minors, since his job depends on him presenting such individuals as his wife's former older lover in the worst possible light--he could easily have egged his wife on to report this guy she once shared these experiences with while under age after he regained contact with her via FB.

This is another good reason not to consider any underage girl worth breaking the law over, because you never know what influences she will run into when she inevitably changes and comes under a myriad array of new influences as she grows older. She may grow up to be an even stronger and more self-confident person than she was before, one who would never let anyone else tell her how she felt, or how she "should" have felt, about any given experience from her younger days--or she might change in such a way that she is more impressionable as an adult than she was when she was underage, and modified her feelings according to what it took for the crowd she now hangs with--or the man she married--to accept her. I have known more than one girl who was, for instance, a highly open-minded practicing Wiccan in her early adolescent girls, only to convert into a typically narrow-minded fundamentalist right-wing Christian upon reaching her early 20s after she met and came under the influence of an entirely different crowd of friends.